added 0.18 to release notes and mention spider contracts
added 0.18 to release notes and mention spider contracts

elacuesta/scrapy,codebhendi/scrapy,wenyu1001/scrapy,WilliamKinaan/scrapy,Geeglee/scrapy,aivarsk/scrapy,AaronTao1990/scrapy,rootAvish/scrapy,fontenele/scrapy,Lucifer-Kim/scrapy,pfctdayelise/scrapy,Ryezhang/scrapy,xiao26/scrapy,famorted/scrapy,olorz/scrapy,snowdream1314/scrapy,jeffreyjinfeng/scrapy,avtoritet/scrapy,famorted/scrapy,nikgr95/scrapy,cursesun/scrapy,moraesnicol/scrapy,heamon7/scrapy,jc0n/scrapy,devGregA/scrapy,wzyuliyang/scrapy,barraponto/scrapy,famorted/scrapy,dhenyjarasandy/scrapy,IvanGavran/scrapy,csalazar/scrapy,csalazar/scrapy,kashyap32/scrapy,hyrole/scrapy,Preetwinder/scrapy,eLRuLL/scrapy,YeelerG/scrapy,KublaikhanGeek/scrapy,ylcolala/scrapy,Adai0808/scrapy-1,barraponto/scrapy,rahulsharma1991/scrapy,Partoo/scrapy,Preetwinder/scrapy,agusc/scrapy,johnardavies/scrapy,scorphus/scrapy,curita/scrapy,YeelerG/scrapy,jdemaeyer/scrapy,johnardavies/scrapy,scrapy/scrapy,JacobStevenR/scrapy,irwinlove/scrapy,kmike/scrapy,pranjalpatil/scrapy,pombredanne/scrapy,mlyundin/scrapy,mlyundin/scrapy,Cnfc19932/scrapy,stenskjaer/scrapy,joshlk/scrapy,nguyenhongson03/scrapy,smaty1/scrapy,finfish/scrapy,elijah513/scrapy,ramiro/scrapy,bmess/scrapy,fpy171/scrapy,scrapy/scrapy,cyberplant/scrapy,wangjun/scrapy,shaform/scrapy,songfj/scrapy,1yvT0s/scrapy,jc0n/scrapy,agreen/scrapy,pablohoffman/scrapy,tntC4stl3/scrapy,zackslash/scrapy,Bourneer/scrapy,fafaman/scrapy,TarasRudnyk/scrapy,huoxudong125/scrapy,raphaelfruneaux/scrapy,jc0n/scrapy,redapple/scrapy,olorz/scrapy,emschorsch/scrapy,liyy7/scrapy,z-fork/scrapy,finfish/scrapy,smaty1/scrapy,legendtkl/scrapy,agreen/scrapy,dacjames/scrapy,foromer4/scrapy,fqul/scrapy,Partoo/scrapy,stenskjaer/scrapy,yusofm/scrapy,liyy7/scrapy,pablohoffman/scrapy,kimimj/scrapy,arush0311/scrapy,aivarsk/scrapy,amboxer21/scrapy,nowopen/scrapy,emschorsch/scrapy,rolando-contrib/scrapy,nguyenhongson03/scrapy,taito/scrapy,cleydson/scrapy,AaronTao1990/scrapy,yidongliu/scrapy,Chenmxs/scrapy,carlosp420/scrapy,godfreyy/scrapy,dangra/scrapy,rahul-c1/scrapy,URXtech/scrapy,nett55/scrapy,zorojean/scrapy,Bourneer/scrapy,elijah513/scrapy,hwsyy/scrapy,ssh-odoo/scrapy,rahulsharma1991/scrapy,irwinlove/scrapy,barraponto/scrapy,Partoo/scrapy,starrify/scrapy,Digenis/scrapy,avtoritet/scrapy,Chenmxs/scrapy,nowopen/scrapy,tliber/scrapy,IvanGavran/scrapy,heamon7/scrapy,kazitanvirahsan/scrapy,legendtkl/scrapy,Slater-Victoroff/scrapy,hyrole/scrapy,Ryezhang/scrapy,bmess/scrapy,agreen/scrapy,ArturGaspar/scrapy,taito/scrapy,Zephor5/scrapy,GregoryVigoTorres/scrapy,dracony/scrapy,Allianzcortex/scrapy,w495/scrapy,wujuguang/scrapy,dhenyjarasandy/scrapy,zorojean/scrapy,nfunato/scrapy,eLRuLL/scrapy,songfj/scrapy,wangjun/scrapy,webmakin/scrapy,kmike/scrapy,starrify/scrapy,bmess/scrapy,devGregA/scrapy,jiezhu2007/scrapy,pawelmhm/scrapy,fafaman/scrapy,elacuesta/scrapy,farhan0581/scrapy,ashishnerkar1/scrapy,rolando/scrapy,CodeJuan/scrapy,nfunato/scrapy,hansenDise/scrapy,beni55/scrapy,tntC4stl3/scrapy,emschorsch/scrapy,fontenele/scrapy,codebhendi/scrapy,rolando/scrapy,tntC4stl3/scrapy,rahulsharma1991/scrapy,jeffreyjinfeng/scrapy,wenyu1001/scrapy,Allianzcortex/scrapy,nikgr95/scrapy,Parlin-Galanodel/scrapy,farhan0581/scrapy,songfj/scrapy,w495/scrapy,hectoruelo/scrapy,Lucifer-Kim/scrapy,haiiiiiyun/scrapy,tliber/scrapy,GregoryVigoTorres/scrapy,yarikoptic/scrapy,johnardavies/scrapy,fqul/scrapy,Preetwinder/scrapy,pombredanne/scrapy,taito/scrapy,rdowinton/scrapy,fpy171/scrapy,finfish/scrapy,fafaman/scrapy,Chenmxs/scrapy,dgillis/scrapy,dangra/scrapy,hansenDise/scrapy,darkrho/scrapy-scrapy,darkrho/scrapy-scrapy,kalessin/scrapy,gbirke/scrapy,joshlk/scrapy,jorik041/scrapy,ashishnerkar1/scrapy,nfunato/scrapy,1yvT0s/scrapy,jorik041/scrapy,raphaelfruneaux/scrapy,zhangtao11/scrapy,jdemaeyer/scrapy,ramiro/scrapy,sigma-random/scrapy,codebhendi/scrapy,crasker/scrapy,WilliamKinaan/scrapy,beni55/scrapy,hectoruelo/scrapy,eliasdorneles/scrapy,chekunkov/scrapy,webmakin/scrapy,Cnfc19932/scrapy,devGregA/scrapy,dracony/scrapy,rootAvish/scrapy,dacjames/scrapy,hwsyy/scrapy,Timeship/scrapy,wenyu1001/scrapy,TarasRudnyk/scrapy,rolando/scrapy,sardok/scrapy,Ryezhang/scrapy,elacuesta/scrapy,mgedmin/scrapy,ssteo/scrapy,eliasdorneles/scrapy,yusofm/scrapy,rahul-c1/scrapy,Timeship/scrapy,aivarsk/scrapy,IvanGavran/scrapy,coderabhishek/scrapy,Bourneer/scrapy,tliber/scrapy,shaform/scrapy,stenskjaer/scrapy,umrashrf/scrapy,yarikoptic/scrapy,URXtech/scrapy,TarasRudnyk/scrapy,lacrazyboy/scrapy,jdemaeyer/scrapy,WilliamKinaan/scrapy,YeelerG/scrapy,yusofm/scrapy,shaform/scrapy,snowdream1314/scrapy,lacrazyboy/scrapy,yarikoptic/scrapy,agusc/scrapy,wzyuliyang/scrapy,profjrr/scrapy,github-account-because-they-want-it/scrapy,cyberplant/scrapy,godfreyy/scrapy,rootAvish/scrapy,agusc/scrapy,cyrixhero/scrapy,eliasdorneles/scrapy,gnemoug/scrapy,pranjalpatil/scrapy,JacobStevenR/scrapy,olafdietsche/scrapy,yidongliu/scrapy,webmakin/scrapy,Timeship/scrapy,rklabs/scrapy,hectoruelo/scrapy,redapple/scrapy,raphaelfruneaux/scrapy,Adai0808/scrapy-1,hbwzhsh/scrapy,gbirke/scrapy,Geeglee/scrapy,z-fork/scrapy,ambox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